diff --git a/tests/test_halos/test_globular_clusters.py b/tests/test_halos/test_globular_clusters.py
index 5d9f5d1..dc6ed86 100644
--- a/tests/test_halos/test_globular_clusters.py
+++ b/tests/test_halos/test_globular_clusters.py
@@ -48,7 +48,7 @@ def test_mass(self):
                                   args, 1)
         profile_args = profile.profile_args
         rho0 = profile_args['rho0']
-        r_core = profile_args['r_core_arcsec']
+        r_core = profile_args['r_core_kpc']
         r_max = profile_args['gc_size']
         gamma = profile_args['gamma']
         total_mass = profile._prof.mass_3d(r_max, rho0, r_core, gamma)